JP2884834B2 - Anti-vibration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator, and more particularly, to a vibration isolator used for an engine mount of a vehicle.

[0002]

2. Description of the Related Art As a conventional vibration isolator, for example, "J3
The one described on page B-68 of "Introduction of Type 0 Car (October 1988, issued by Nissan Motor Co., Ltd.)" is known, and is shown in FIG. In FIG. 6, reference numerals 1, 2, and 3 denote insulators. The insulators 1, 2, and 3 have inner cylinders 1a, 2a, and 3a, respectively, and rubber members 1b, 2b, and 3b vulcanized and bonded to these inner cylinders. I have. The insulators 1, 2, 3 are juxtaposed such that the axes of the inner cylinders 1a, 2a, 3a are aligned with each other so that the end faces of the inner cylinders are in contact with each other, and are fastened by bolts and nuts (not shown).
That is, the bolt is passed through the inner cylinders 1a, 2a, 3a in the direction of arrow H in FIG. 6 such that the head of the bolt comes into contact with the end face 1c of the inner cylinder 1a and the nut comes into contact with the end face 3c of the inner cylinder 3a. Then, a nut is screwed into the bolt and rotated in the direction of arrow J in FIG. When the anti-vibration device having the above configuration is used for an engine mount of a vehicle, the rubber members 1b, 3b
Is connected to the vehicle body side member via an outer cylinder (not shown), for example.
Similarly, the rubber member 2b is connected to an engine-side member via an outer cylinder (not shown). As a result, two rubber members are arranged in series between the engine and the vehicle body, and such a vibration isolator has a so-called double vibration isolating structure.

[0003]

However, in such a conventional vibration isolator, the insulator 1, the insulator 1,
Since the end faces of the nuts 2 and 3 are simply brought into contact with each other and fastened by the bolt and the nut, if the fastening tool is removed from the nut after fastening the bolt and the nut, that is, if the tightening force is released, the insulator 3 The torsion of the rubber member 3b is released, and the inner cylinder 2a and the rubber member 2b of the insulator 2 are twisted via the inner cylinder 3a.

Accordingly, an object of the present invention is to improve the fastening accuracy when fastening insulators.

[0005]

In order to solve the above-mentioned problems, the present invention comprises a plurality of insulators having a cylindrical member and an elastic member adhered to an outer peripheral surface of the cylindrical member.
In a state where the insulators are arranged side by side so that the end faces of the adjacent tubular members abut against each other, a bolt is inserted so as to penetrate each inner cylinder from one end side in the arrangement direction of the insulators, and the arrangement direction of the insulators In the vibration isolator in which the insulators are bolted to each other by screwing a nut to the tip of a bolt protruding from the tubular member at the other end side of the tubular member, one of the tubular members adjacent to each other is screwed. Has a convex portion projecting toward the other cylindrical member, the other cylindrical member has a concave portion engaging with the convex portion, and the circumferential direction of the inner cylinder of the convex portion and the concave portion engaging with each other. Are substantially matched with each other.

[0006]

According to the present invention, when the insulators are fastened to each other by the bolts and the nuts, a rotational force is applied from the nut to the cylindrical member abutting on the nut. It is regulated by the engagement, and the occurrence of twist between the tubular members is prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 to 5 are views showing an embodiment of a vibration isolator according to the present invention. First, the configuration will be described. In FIG. 1 to FIG.
1, 12, 13 are insulators, and insulator 1
Reference numerals 1, 12, and 13 each include an inner cylinder (cylindrical member) 21, 22, 23, rubber members 31, 32, 33, and outer cylinders 41, 42, 43. The rubber members 31, 32, 33 are respectively vulcanized and bonded to the outer peripheral surfaces of the inner cylinders 21, 22, 23 and the inner peripheral surfaces of the outer cylinders 41, 42, 43. The insulators 11, 1 and 1 are arranged such that the axes of the inner cylinders 11, 12, and 13 are aligned and the end faces of the adjacent inner cylinders are in contact with each other.
2 and 13 are installed side by side. In this state, a bolt (not shown) is inserted from one end in the direction in which the insulators are arranged, that is,
1 is inserted from the end face 21a side of the inner cylinder 21 in the direction of arrow A so as to penetrate the inner cylinders 21, 22, 23, and protrudes from the inner cylinder 23 at the other end in the direction in which the insulators are arranged. A nut (not shown) is screwed into the tip of a bolt protruding from the end face 23a of the nut 23, and the nut is rotated and fastened in the direction of arrow B in FIG. 1 so that the insulators 11, 12, and 13 are bolted to each other. . Therefore, the head of the bolt is the inner cylinder
The nut comes into contact with the end face 21 a of the inner cylinder 23, and the nut comes into contact with the end face 21 a of the inner cylinder 23.

The inner cylinder 22 includes an inner cylinder main body 22a and a pair of pins 22b and 22c. The pins 22b and 22c project from both end surfaces of the inner cylinder main body 22a toward the inner cylinders 21 and 23, respectively. Is embedded in the inner cylinder main body 22a. This pin 22
The protrusions 22d and 22e of the present application are constituted by the protrusions b and 22c. The inner cylinders 21 and 23 have concave portions that engage with the convex portions 22d and 22e.
21b and 23b are formed. Convex portions 22d engaging each other
The width of the concave portion 21b along the circumferential direction of the inner cylinder is substantially the same as shown in FIG. Figure 3
As shown in FIG.

According to the above-described structure, the convex portions 22d and 22e and the concave portions 21b and 23b are formed in each of the adjacent inner cylinders so that the circumferential widths of the inner cylinders substantially coincide with each other. Therefore, the relative rotation of the adjacent inner cylinders can be restricted by the engagement between the convex portions and the concave portions. Therefore, when fastening the insulators 11, 12, and 13 with bolts, a rotational force is applied from the nut to the inner cylinder 23 that contacts the nut,
It is possible to prevent the occurrence of twist between the tubular members due to the engagement between the protrusions and the recesses, and it is possible to improve the fastening accuracy. Further, by reducing the dimensional tolerance between the convex portions 22d and 22e and the concave portions 21b and 23b, the fastening accuracy can be further improved.

As shown in FIGS. 4 and 5, a rubber member
Punch marks M ₁ and M ₂ are formed on the end surfaces of 31, 32 and 33 by rubber embossing. For this reason, the rubber members 31 and 3
Position in the circumferential direction relative to the inner cylinder 21, 22, 23 2, 33, as punch mark M ₁ is positioned on the center line L ₁ of the concave portion 21b, 23b, also punch mark M ₂ pins 22b, 22c so as to be positioned on the center line L ₂ of, it is positioned. Also,
When the present embodiment is applied to, for example, an engine mount of a vehicle, the outer cylinders 41 and 43 are connected to members on the vehicle body side, and the outer cylinder 42 is connected to members on the engine side. You.

[0011]

According to the present invention, since the relative rotation of the adjacent inner cylinders is regulated by the engagement of the projections and the recesses, when the insulators are bolted together, there is no twist between the cylindrical members. This can be prevented from occurring, and the fastening accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a vibration isolator according to the present invention.

FIG. 2 is a sectional view taken along the line XX in FIG.

FIG. 3 is a sectional view taken along the line YY in FIG. 1;

FIG. 4 is a front view of an outer insulator in FIG. 1;

FIG. 5 is a front view of a central insulator in FIG. 1;

FIG. 6 is a sectional view of a main part of a conventional vibration isolator.

[Explanation of symbols]

 11, 12, 13 Insulators 21, 22, 23 Inner cylinder (cylindrical member) 22d, 22e Convex part 21b, 23b Concave part

Claims (1)

(57) [Claims] A plurality of insulators having a cylindrical member and an elastic member adhered to an outer peripheral surface of the cylindrical member, wherein the insulators are arranged side by side so that end surfaces of adjacent cylindrical members abut against each other. In this state, the bolts are inserted from one end of the insulator in the direction in which the insulators are arranged so as to penetrate each inner cylinder, and the nut is screwed into the tip of the bolt protruding from the tubular member at the other end in the direction in which the insulators are arranged. In the vibration damping device in which the insulators are bolted to each other by the fastening, one of the adjacent tubular members has a convex portion protruding toward the other tubular member, and the other A vibration isolator, wherein the shape member has a concave portion that engages with the convex portion, and the width of the convex portion and the concave portion that engage with each other along the circumferential direction of the inner cylinder substantially match.